U-Net Plus: Deep Semantic Segmentation for Esophagus and Esophageal Cancer in Computed Tomography Images. - Shuchao Chen; Han Yang; Jiawen Fu; Weijian Mei; Shuai Ren; Yifei Liu; Zhihua Zhu; Lizhi Liu; Haojiang Li; Hongbo Chen (IEEE Access, 2019)